ISR Performance Turbo Kit - Mazda Miata NA 1.6 - With RS T25/28 Turbo

The ISR Performance Turbo Kit is a complete bolt-on turbocharger system for the 1.6L Mazda Miata NA (1989-1993). Built around the proven ISR RST25/28 turbocharger with a tubular Schedule 10 manifold, chassis-specific intercooler, full polished aluminum piping, and AN-fitted oil and water lines. One of the most complete affordable turbo kits available for the NA Miata platform.

What It Does

Turbo-swapping a Miata is a well-known path to making the chassis feel as quick as it handles, and complete kits like this one shortcut the parts-collection problem. Everything you need to bolt the turbo system to a 1.6L NA Miata is in the box: turbo, manifold, intercooler, piping, downpipe, oil and water plumbing, and AFM delete intake. The Schedule 10 tubular manifold resists cracking far better than cast or thin-wall tubular alternatives, which matters on a turbo Miata that'll see heat cycle abuse.

This is designed around an aftermarket ECU with a MAP sensor (not the factory MAF), so plan for that and the supporting fueling work in your build budget.

Critical Build Requirements

Aftermarket ECU required. The kit is designed for use with an aftermarket standalone or piggyback ECU running on a MAP sensor. The AFM (factory mass airflow sensor) is deleted by the included intake, so you cannot run this kit on a factory MAF-based ECU.

Hotpipe BOV flange sold separately. The included hotpipe is modular and accepts HKS, GReddy, or TiAL flanges, but the flange itself isn't in the box. Pick the flange that matches your chosen BOV.

2.5-inch hole required for intercooler piping. Routing the intercooler piping through the chassis requires drilling a 2.5-inch hole. Plan for this during install.

Fitment

• 1989-1993 Mazda Miata NA (1.6L B6 engine)

Not compatible with: 1.8L NA Miata (1994-1997), NB Miata, NC Miata, or any non-Miata application.

What's in the Box

• 1x ISR Performance RST25/28 turbocharger
• 1x Schedule 10 tubular bottom-mount turbo manifold
• 1x Chassis-specific intercooler with mounting bracket
• 1x Full polished aluminum intercooler piping kit
• 1x Modular hotpipe (accepts HKS, GReddy, or TiAL BOV flanges)
• 1x Turbine outlet O2 housing and downpipe
• 1x AN oil feed line
• 1x AN water line set
• 1x -10AN turbo oil drain line with aluminum weld bung for the factory oil pan
• 1x AFM delete intake with air filter

Sold Separately

• Aftermarket ECU
• BOV (HKS, GReddy, or TiAL) and the matching flange
• MAP sensor and supporting fueling

Product Details

Brand: ISR Performance

Part Number: IS-NA16TurboKit-T28

Type: Complete Bolt-On Turbo Kit

Vehicle Fitment: 1989-1993 Mazda Miata NA 1.6L

Engine Compatibility: Mazda B6 1.6L (NA Miata 1989-1993 only)

Turbocharger: ISR RST25/28 (included)

Manifold: Schedule 10 tubular, bottom mount

Intercooler: Chassis-specific with mounting bracket

Piping Finish: Polished aluminum

Exhaust Components: 304 stainless steel

Oil Drain Bung: -10AN aluminum, weld-in

Required Separately: Aftermarket ECU with MAP sensor, BOV + flange

Modification Required: 2.5-inch hole for intercooler piping routing

Sold: Complete turbo kit

Legality: Off-road and competition use only